. Carnegie Institution of Washington publication. THE CACTACEAE. 136 ovary 3 to cm. long, with very many areoles bearing numerous glochids; style thick; stigma- lobes 8 to io, greenish white; fruit reddish, clavate, cm. long, with a depressed umbilicus; seeds small, 3 to mm. broad. Type locality: Argentina, between Rio Negro and Rio Colorado. Distribution: Southern Argentina. According to Dr. Spegazzini, this species is not near to any of the known South Ameri- can species, but resembles somewhat the North American species 0. microdasys and 0. basilaris. We know it only from the de
. Carnegie Institution of Washington publication. THE CACTACEAE. 136 ovary 3 to cm. long, with very many areoles bearing numerous glochids; style thick; stigma- lobes 8 to io, greenish white; fruit reddish, clavate, cm. long, with a depressed umbilicus; seeds small, 3 to mm. broad. Type locality: Argentina, between Rio Negro and Rio Colorado. Distribution: Southern Argentina. According to Dr. Spegazzini, this species is not near to any of the known South Ameri- can species, but resembles somewhat the North American species 0. microdasys and 0. basilaris. We know it only from the description. OPUNTIA CALANTHA Griffiths, Bull. Torr. Club 43: 524. 1916. A low, creeping, prostrate plant 15 cm. high, one meter in diameter; joints obovate, narrowed above and below, inequilateral, n cm. long, 4 cm. broad, tuberculate-wrinkled, mostly deep green; areoles i to mm. long, obovate, at first tawny, turning gray; leaves small, subulate, cuspidate, red. i mm. long; glochids yellow; spines 5 to io, up to 5 mm. long; flowers carmine; fruit globular, cm. in diameter. Recorded as probably of South American origin and usually distributed as Opuntia microdisca, but from which it is said to differ very much. The plant is known to us only from the description of cultivated specimens. Series 9. STRIGILES. The series consists of a single species, native of Texas. It is a low, bushy plant with large joints bear- ing many areoles, these close together, each with sev- eral acicular, reddish brown spines; the fruit is small. 131. Opuntia strigil Engelmann, Proc. Amer. Acad. 3: 290. 1856. Suberect, 6dm. high; joints orbicular to obovate, io to cm. long; areoles close together, prominent; spines 5 to 8, spreading, many of them appressed to the joint and deflexed, red to reddish brown with lighter tips, the longer ones ; glochids numerous; flowers unknown; fruits small, nearly globular, 12 mm. in diameter, trun- cate, red; areoles on fruit very small; seeds 3 mm
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